Watchcase



Oct. 21. 1924.

E. KALWEIT WATCHCASE Filed Feb. 8 1924 Patented Oct. 2l, 1924.

UNITED sTATEs PATENTy OFFICE.

EDWARD KALWEIT, OF BROOKLYN, NEW YORK, ASSIGNOR 'IO BELOVE WATCH CASE CO., F NEW'YORK, N. Y., il CORPORATION O'F. NEW YORK.

WATCHCASE.

Application filed February 8, 1924.

To all whomt mct/ concern i Be it known that I, EDWARD KaLwniT, a citizen of Russia, and a resident of Brooklyn, Kings County, and State of New York, have invented certain new and useful Improvements in lVatchcases, of which the iollowin is a specilication.

This invention relates to wrist watches and the objects of the invention are to provide an improved strap loop construct-ion for watches ot' this 'type which will be more secure and at the same time less expensive than the constructions now in use and which, Yfurthermore, will present a better appearance.

The t'oregoing and other objects are attained `thrmgh certain novel features of construction, combination and relation of parts as set forth in the following specilication.

In the accompanying drawing illustrating a ractical embodiment or' the invention ligure l is a plan view showing one of the loop forming staples as it is held in the shoulder-forming dies.

Figure 2 'is a cross sectional view as on substantially the plane of line 2`2 of Figure l, showing the case engaged over the projecting ends of the loop and the riveting plunger ready to upset7 the ends of the loo at the inside of the case.

.igure 3 is an inside view of the completed case with the strap loops permanently secured in place.

Figure 4l is an enlarged broken sectional View of the joint between the loop and case.

The wat-ch case or shell 5 is shown as of typical construction, having opposite hat sides 6 for the attachment ot the strap loops 7.

These strap loops are usually made of wire bent to staple form and prior to this invention have been secured in place by sol" dering the ends of the same to the outer surface of the case. These soldered joints vary both in strength and appearance and because of the small areas of contact between the ends of the loop and the case, provide at best a rather' insecure form of oint. These soldering operations,-also, are relatively eX- pensive and require skilled labor.

In the present invention the ends ot the strap loops are passed through opening 8 in the fiat sides of the case and headed at the Serial No. 691,343.

inside of the case, as indicated at 9. As aA providing the same is illustrated in FiguresL l and 2, where lf) and 13 designate companion die members for squeezing out these fins. These dies have coopera-ting recesses let to receive the shank port-ions of the loops, forming cavities slightly smaller than the diameter of the shanlrs so that when the loops are positioned between the dies and the dies brought together, the shanlzs will be reduced in diameter at 15 and the excess or".

metal thus provided be squeezed out at the sides in the torni of the tapered tins.

rEhe gripping eillort of the dies is utilized to hold the loop in position for engaging the watch case thereover and while thehfeading over operation is being perfo 1ined. As shown in Figure 2 the dies grip the loop so that the ends or" the saine project far enough for the casing to be slipped over the same and when the two parts are thus assembled, a plunger i6 descends and flattens the loop ends over into engagement with the inner surface of the shell. In this way the three operations cit shouldering the loop, assembling the case and loop and iinally heading over the ends of the loop at the inside of the case are all performed in the one mechanism and in a series oi quickly succeeding steps. Furthermore, these operations are quite sim ple and may be accomplished without the exercise of any special skill.

The invention, it will be seen, provides a permanent and rigid joining of the strap loops to the watch case and the structure has the further advantage of providing a much neater and stronger connection Athan can be effected by soldering. Preferably, in the riveting operation considerable pressure is applied, sutlicient to flatten the heads down into ,the metal of the case, in the manner indicated in Figure il, so as to leave the inside surface of the case smooth and free of any obstructions. The heavy pressure employed also has a tendency to force the case down over the shoulders or fins lO. The result of these effects is to make the loop practically an integral part of the case.

What is claimed is:

l. ln combination, a Watch case having openings in the side of the same and a strap loop having its ends passed through said openings and flattened down into holding engagement With the inside of the case, said loop further having` integral enlargements providing shoulders engaging the outside of the case and said shoulders and said flattened ends respectively being forced into the outer and into the inner surface of the case, whereby said loop is braced and rigidly held by integral portions both inside and outside kthe case and which are embedded in the material of the case.

2. In combination With a Watch case having an opening in one side, a strap loop having integral fins pinched out at the sides of the same limiting the extent of entry into the opening in the case and the end of the loop being headed over inside the case to rigidly and permanently secure said loop in place.

3. The process of attaching a strap loop to a Watch case which comprises squeezing an integral enlargement in the shank portion of' the loop, engaging a Watch case shell over the projecting end of said shank while the same is held by the squeezing mechanism, flattening over the end of the shank inside the shell While the loop is still held by the saine mechanism and forcing said flattened end down into the material inside the case, displacing such material beneath the flattened portion sufficiently to receive the same sub- .by the same mechanism.

5. ln a structure of the character disclosed, a Watch case or the like and a strap loop having an integral shoulder at the outer :tace of the case and a head inside the case, said head being flattened down into the Wall of the case and the material of the Wall beneath said head being displaced laterally by the head to thereby provide a self-conforming seat for the head and form a rigid permanent joint substantially flush and smooth at the inner surface of the case.

6. ln structure of the character disclosed, a Watch case or the like and a strap loop having an integral shoulder at the outer face of the case and a head inside the case, said head being iiattened down into the Wall ofl the case and the material of the Wall beneath said head being displaced laterally by the head to thereby provide a self-conforming seat for the head and form a rigid permanent joint substantially flush and smooth at the inner surface of the case, the material at the outer surface of the wall being similarly displaced by the shoulder thereat to provide a self-conforming seat therefor.

In Witness whereof, I have hereunto set my hand this 6th day of February, 1924.

EDWARD KALWEIT. 

